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Climate Change Drives Endangered Seabird Into UK Waters

Date:

October 24, 2007

Source:

Royal Society for the Protection of Birds

Summary:

Around 10 per cent of the world population of Balearic shearwaters has visited UK inshore waters this summer and autumn, with more than 1,200 birds being recorded from just one watchpoint near Land's End in Cornwall. Balearic shearwaters are the only European seabird to be classified as 'critically endangered' on the recently released 2007 International Union for Conservation of Nature and Natural Resources Red List. They could become extinct by 2050 if current rates of decline continue.

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Around 10 per cent of the world population of Balearic shearwaters has visited UK inshore waters this summer and autumn, with more than 1,200 birds being recorded from just one watchpoint near Land's End in Cornwall.

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The findings come from a new survey, led by scientists at the National Oceanography Centre, Southampton (NOCS) in collaboration with the RSPB, which has been monitoring numbers of the birds off the coast of South West England.

Balearic shearwaters are the only European seabird to be classified as 'critically endangered' on the recently released 2007 International Union for Conservation of Nature and Natural Resources (IUCN) Red List. They could become extinct by 2050 if current rates of decline continue.

Dr Russell Wynn, who is co-ordinating the SeaWatch SW survey, said: 'Balearic shearwaters leave their Mediterranean breeding colonies in late summer and head for richer feeding grounds along north Atlantic coasts. The numbers recorded during the survey this year show how important our inshore waters are to this highly vulnerable seabird'.

The survey builds upon new research recently published in the Royal Society journal, Biology Letters, which highlights global warming as a key driver behind the upsurge in UK Balearic shearwater sightings.

Dr Wynn and colleagues showed how northeast Atlantic sea surface temperatures rose by 0.6 degrees Celsius in the mid-1990s, triggering a northwards shift in the Balearic shearwater's prey fish species and with it the birds that feed on them.

'Just 20 years ago Balearic shearwaters were scarce visitors to South West waters, but they are now regularly recorded from headlands throughout the UK. Since 2003 we have even started seeing birds staying throughout the winter off Cornwall and the Isles of Scilly, which is a completely new phenomenon linked to elevated winter sea temperatures,' said Dr Wynn.

Changes in fish distribution and abundance mean that many Balearic shearwaters are being forced to migrate 20% further - over 400 miles - in search of food than they did a few years ago.

Experts say the effects on survival of individual birds are hard to assess, but could well be contributing to the species highly endangered status.

Dr Wynn added: 'Climate change is often perceived to be a future threat, but the reality for our marine fauna is that it is happening now. Species towards the top of the food chain are having to respond very rapidly in order to survive, and some are going to be pushed to extinction if they fail'.

Protection needed

Marine wildlife faces a variety of other threats in addition to climate change, but enjoys little or no legal protection in UK seas. The RSPB, along with other conservation organisations, is campaigning for the Government to include a Marine Bill in this year's Queen's Speech. The draft Bill includes proposals for a new system of marine planning and licensing, modernising fisheries management and the introduction of Marine Conservation Zones.

The RSPB's South West seabird specialist, Helen Booker, said: 'The Government has recently placed Balearic shearwaters on its new 'BAP list' of priority species needing conservation action, because the birds face an extreme threat of global extinction.

Royal Society for the Protection of Birds. (2007, October 24). Climate Change Drives Endangered Seabird Into UK Waters. ScienceDaily. Retrieved March 3, 2015 from www.sciencedaily.com/releases/2007/10/071020093648.htm

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